m3 protective screen

oh crap
yeah, i took mine off to clean it cause it was dirty(it bugged me) and it wouldn't go back on, i feel really stupid and regret it (now it even looks worse.)
I am now using the plastic case it came with as a bonus but I lost the little button for the skip button.
does anyone know where to get protective screens(which probably wouldn't help it wouldn't be very clean to put on) but those plastic cases would be a good thing to get.

also the rubber cases mine ripped, know where they sell those?

also also, does anyone know what you can clean it with(like the back of it mine is all, smeared)

I took mine off too and now it's all scratched up!! DD=